Question

A rigid tank contains 20lb_{m} of air at 80ºF and 35
psig. Heat is added until the pressure doubles to 70 psig.
R_{air} = 0.3704 psia-ft^{3}/lbm-R

- Draw the P-v and T-v diagrams for the problem.
- What is the volume of the tank ft
^{3}? - What is final temperature of the air in ºF?
- How much heat is transferred in the process in Btu?

Answer #1

A compressed air tank has a volume of 0.81 ft3. The
temperature is 70 °F and the atmospheric pressure is 14.7 psia.
When the tank is filled with air at a pressure of 46 psig,
determine the density of the air and the weight of air in the
tank.
Answer in lb

1. A tank of air contains 100 ft^3. The pressure and temperature
are 1000 F and 100 psia. The air
is cooled to 100 F.
a. Find the mass of the air
b. Find the initial energy of the tank (Btu)
c. Find the final energy of the tank (Btu)
d. Compute the heat (Btu)
2. Water is contained inside a constant pressure piston cylinder
device. The initial temperature
and quality of the water are x=0 and T=300 F. The...

A closed, rigid tank is filled with water. Initially, the tank
holds 1.0 lb of saturated vapor and 7.0 lb of saturated liquid,
each at 212°F. The water is heated until the tank contains only
saturated vapor. Kinetic and potential energy effects can be
ignored. Determine the volume of the tank, in ft3, the temperature
at the final state, in °F, and the heat transfer, in Btu.

A piston cylinder contains 2 lbm of air and operates at a
constant pressure of 400 psia. The initial volume is 1 ft.3 and the
initial temperature is 100°F. The final volume is 4 ft.3 and the
final temperature is 1780°F. Determine the work and its direction
(in or out) and the heat transfer and its direction, in
Btu/lbm.

A rigid tank contains steam at 120 bar, 350C. The tank is cooled
until its contents become saturated vapor. Determine the
temperature and pressure at the final state
Please use interpolation to do this problem

A rigid, well-insulated tank, with a volume of 0.057 m3 ,
contains air at p1 = 1.4 bar, T1 = 280 K. The air is stirred by a
paddle wheel, resulting in an energy transfer to the gas of
magnitude 6.78 kJ. Assuming ideal gas behavior for the air,
determine the final temperature, in K, and the final pressure, in
bar. Neglect kinetic and potential energy effects

A rigid tank has a volume of 0.01 m3. It
initially contains saturated water at a temperature of 200
oC and a quality of 0.4. The top of the
tank contains a pressure regulating valve which maintains the vapor
at constant pressure. This system undergoes a process where it is
heated until all the liquid vaporizes. How much heat in (kJ) is
required? You may assume there is no pressure drop in the exit
line.

a) A closed tank of fixed volume initially contains air at 200
kPag (gauge) pressure and 20oC temperature. One (1.0) kilogram of
air is added to the tank by an air compressor to bring the tank
pressure to 300 kPag and temperature to 32oC. Find the tank volume.
Specify any assumptions used.
b) To the same tank as above, a gas mixture containing CO and
CO2 is added to replace the air. With 2 kg of the gas mixture
added,...

A rigid tank, with a volume of 25 L, contains nitrogen at 355 K and 1.2 MPa. The tank is then cooled to 120 K. What work has been done and the heat transferred in this process? Data: Cv = 0.745 kJ/kgK, Cp = 1.042 kJ/kgK, MM(N2)=28 g/mol, R = 8.314 m^3 Pa/molK.
Use the ratio PV = nRT to determine the amount of nitrogen contained in the tank.

(10 pts) A 10 m3 rigid storage tank contains oxygen
gas (R = 0.2598 kJ/kg.K, cp = 0.918 kJ/kg.K,
cv = 0.658 kJ/kg.K). The tank is initially 200 kPa and
600o It is cooled to 25oC in 35 minutes.
Determine:
(3 pts) The mass of oxygen in the tank, in kg.
(3 pts) The final pressure in the tank, in kPa.
(4 pts) The rate of heat transfer from the oxygen, in kW.

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